private static bool IsAnonymous(StructClass cl, StructClass enclosingCl)
{
// checking super class and interfaces
int[] interfaces = cl.GetInterfaces();
if (interfaces.Length > 0)
{
bool hasNonTrivialSuperClass = cl.superClass != null && !VarType.Vartype_Object.Equals
(new VarType(cl.superClass.GetString(), true));
if (hasNonTrivialSuperClass || interfaces.Length > 1)
{
// can't have multiple 'sources'
string message = "Inconsistent anonymous class definition: '" + cl.qualifiedName
+ "'. Multiple interfaces and/or super class defined.";
DecompilerContext.GetLogger().WriteMessage(message, IFernflowerLogger.Severity.Warn
);
return(false);
}
}
else if (cl.superClass == null)
{
// neither interface nor super class defined
string message = "Inconsistent anonymous class definition: '" + cl.qualifiedName
+ "'. Neither interface nor super class defined.";
DecompilerContext.GetLogger().WriteMessage(message, IFernflowerLogger.Severity.Warn
);
return(false);
}
// FIXME: check constructors
// FIXME: check enclosing class/method
ConstantPool pool = enclosingCl.GetPool();
int refCounter = 0;
bool refNotNew = false;
StructEnclosingMethodAttribute attribute = cl.GetAttribute(StructGeneralAttribute
.Attribute_Enclosing_Method);
string enclosingMethod = attribute != null?attribute.GetMethodName() : null;
// checking references in the enclosing class
foreach (StructMethod mt in enclosingCl.GetMethods())
{
if (enclosingMethod != null && !enclosingMethod.Equals(mt.GetName()))
{
continue;
}
try
{
mt.ExpandData();
InstructionSequence seq = mt.GetInstructionSequence();
if (seq != null)
{
int len = seq.Length();
for (int i = 0; i < len; i++)
{
Instruction instr = seq.GetInstr(i);
switch (instr.opcode)
{
case opc_checkcast:
case opc_instanceof:
{
if (cl.qualifiedName.Equals(pool.GetPrimitiveConstant(instr.Operand(0)).GetString
()))
{
refCounter++;
refNotNew = true;
}
break;
}
case opc_new:
case opc_anewarray:
case opc_multianewarray:
{
if (cl.qualifiedName.Equals(pool.GetPrimitiveConstant(instr.Operand(0)).GetString
()))
{
refCounter++;
}
break;
}
case opc_getstatic:
case opc_putstatic:
{
if (cl.qualifiedName.Equals(pool.GetLinkConstant(instr.Operand(0)).classname))
{
refCounter++;
refNotNew = true;
}
break;
}
}
}
}
mt.ReleaseResources();
}
catch (IOException)
{
string message = "Could not read method while checking anonymous class definition: '"
+ enclosingCl.qualifiedName + "', '" + InterpreterUtil.MakeUniqueKey(mt.GetName
(), mt.GetDescriptor()) + "'";
DecompilerContext.GetLogger().WriteMessage(message, IFernflowerLogger.Severity.Warn
);
return(false);
}
if (refCounter > 1 || refNotNew)
{
string message = "Inconsistent references to the class '" + cl.qualifiedName + "' which is supposed to be anonymous";
DecompilerContext.GetLogger().WriteMessage(message, IFernflowerLogger.Severity.Warn
);
return(false);
}
}
return(true);
}
/// <exception cref="IOException"/>
public virtual void ProcessClass(ClassesProcessor.ClassNode node)
{
foreach (ClassesProcessor.ClassNode child in node.nested)
{
ProcessClass(child);
}
ClassesProcessor clProcessor = DecompilerContext.GetClassProcessor();
StructClass cl = node.classStruct;
if (cl.GetBytecodeVersion() < ICodeConstants.Bytecode_Java_8)
{
// lambda beginning with Java 8
return;
}
StructBootstrapMethodsAttribute bootstrap = cl.GetAttribute(StructGeneralAttribute
.Attribute_Bootstrap_Methods);
if (bootstrap == null || bootstrap.GetMethodsNumber() == 0)
{
return;
}
// no bootstrap constants in pool
BitSet lambda_methods = new BitSet();
// find lambda bootstrap constants
for (int i = 0; i < bootstrap.GetMethodsNumber(); ++i)
{
LinkConstant method_ref = bootstrap.GetMethodReference(i);
// method handle
// FIXME: extend for Eclipse etc. at some point
if (Javac_Lambda_Class.Equals(method_ref.classname) && (Javac_Lambda_Method.Equals
(method_ref.elementname) || Javac_Lambda_Alt_Method.Equals(method_ref.elementname
)))
{
lambda_methods.Set(i);
}
}
if (lambda_methods.IsEmpty())
{
return;
}
// no lambda bootstrap constant found
Dictionary <string, string> mapMethodsLambda = new Dictionary <string, string>();
// iterate over code and find invocations of bootstrap methods. Replace them with anonymous classes.
foreach (StructMethod mt in cl.GetMethods())
{
mt.ExpandData();
InstructionSequence seq = mt.GetInstructionSequence();
if (seq != null && seq.Length() > 0)
{
int len = seq.Length();
for (int i = 0; i < len; ++i)
{
Instruction instr = seq.GetInstr(i);
if (instr.opcode == ICodeConstants.opc_invokedynamic)
{
LinkConstant invoke_dynamic = cl.GetPool().GetLinkConstant(instr.Operand(0));
if (lambda_methods.Get(invoke_dynamic.index1))
{
// lambda invocation found
List <PooledConstant> bootstrap_arguments = bootstrap.GetMethodArguments(invoke_dynamic
.index1);
MethodDescriptor md = MethodDescriptor.ParseDescriptor(invoke_dynamic.descriptor);
string lambda_class_name = md.ret.value;
string lambda_method_name = invoke_dynamic.elementname;
string lambda_method_descriptor = ((PrimitiveConstant)bootstrap_arguments[2]).GetString
();
// method type
LinkConstant content_method_handle = (LinkConstant)bootstrap_arguments[1];
ClassesProcessor.ClassNode node_lambda = new ClassesProcessor.ClassNode(content_method_handle
.classname, content_method_handle.elementname, content_method_handle.descriptor,
content_method_handle.index1, lambda_class_name, lambda_method_name, lambda_method_descriptor
, cl);
node_lambda.simpleName = cl.qualifiedName + "##Lambda_" + invoke_dynamic.index1 +
"_" + invoke_dynamic.index2;
node_lambda.enclosingMethod = InterpreterUtil.MakeUniqueKey(mt.GetName(), mt.GetDescriptor
());
node.nested.Add(node_lambda);
node_lambda.parent = node;
Sharpen.Collections.Put(clProcessor.GetMapRootClasses(), node_lambda.simpleName,
node_lambda);
if (!node_lambda.lambdaInformation.is_method_reference)
{
Sharpen.Collections.Put(mapMethodsLambda, node_lambda.lambdaInformation.content_method_key
, node_lambda.simpleName);
}
}
}
}
}
mt.ReleaseResources();
}
// build class hierarchy on lambda
foreach (ClassesProcessor.ClassNode nd in node.nested)
{
if (nd.type == ClassesProcessor.ClassNode.Class_Lambda)
{
string parent_class_name = mapMethodsLambda.GetOrNull(nd.enclosingMethod);
if (parent_class_name != null)
{
ClassesProcessor.ClassNode parent_class = clProcessor.GetMapRootClasses().GetOrNull
(parent_class_name);
parent_class.nested.Add(nd);
nd.parent = parent_class;
}
}
}
}